Sodium assays are important in assessing acid-base balance, water balance, water intoxication, and dehydration.The test is done to detect abnormal concentrations of sodium, including low sodium (hyponatremia) and high sodium (hypernatremia). It is often used as part of an serum electrolyte or MolQ Complete Health Package & MolQ basic Health Package for a routine health checkup.Sodium is critical in maintaining water and osmotic equilibrium in extracellular fluids. Disturbances in acid base and water balance are typically reflected in sodium concentrations.